Tommy, you have several problems that lead to issues like this. Your turntable is not adequately isolated and Lyra cartridges do not like unipivot arms. You need an isolation platform tuned to 3 Hz or below and a gimbal pivoted arm, then the Delos will work fine. Lyra cartridges are relatively compliant and that arm is also too heavy for it.
VPI Prime Sig/Lyra Delos / Feedback ...help!
Hello all, strange one here...just picked up a VPI Prime Signature Rosewood and a Lyra Delos with about 20-40 hours on it...sounded great at low volume with my sacred Steely Dan - Aja Cisco pressing . Later that night at higher volumes I'm getting a midrange-low feedback .
Here's my rig :
VPI Prime Sig with Unipvot / Lyra Delos 0.6m output voltage / 1.75 tracking force
Allnic 1202 Phono Pre (variable DB boost +22, +24 , +28, +32)
Manley Snappers / Jumbo Shrimp Pre
Harbeth 40.3XD
So I A/B'd w the old turntable VPI Prime Scout / Unipivot / Hana ML 0.4 Output and all was fine 🤔 I then swapped arms moving the Hana to the Prime Sig , no feedback ....🤔
I've tried adjusting the Allnic (all 4 levels mentioned above) and get feedback with the Lyra on every setting...
The hifi business I purchased from said they had tested thoroughly and had 0 problem with it ...so I'm perplexed , this doesn't seem to be any vibration feedback , is the Lyra just not jiving with my Phonostage for some reason?
Any help appreciated ...
Showing 3 responses by mijostyn
@tommypenngotti, If you have sound in both channels nothing is shorting. Lyra absolutely does not like that arm. They specifically specify "a pivoted arm with rigid bearings or linear tracking arm." That does not include a unipivot for very good reason. They are unstable. You are having more trouble with the Lyra which is a more compliant and more sensitive device than the Hana. It is a great choice just not for that arm and I do not know everybody else's motives, but I do not have one. There are certain aspects to tonearm design that can not be violated. There are plenty of people in the audio business that are not rocket scientists and many have motives that are probably not in sync with yours. Yes! the Fatboy Gimbal is way better. Go for it! |
@tommypenngotti You learn something everyday. I can slam my Sota with a mallet and you can not hear a thing. That is because the "butcher block" is hanging inside from 4 springs. Edgar Villchur was fascinated by the problem (which he also created with his loudspeakers) and Came up with the AR XA in the late 50's. It sold for something like $67.00 and within a couple of years everybody had one. They were outperforming turntables costing over $500. You could not get one to feedback if you tried and they didn't sound like an express train in the background. I never got an AR. My first suspended table was a Linn LP12. You need to get a real suspension platform. I am familiar with MinusK and Vibraplane. To isolate a turntable you have to use a mechanical filter, three of four springs tuned to a resonance frequency below 3 Hz. Bob your head three times in a second. That fast. You have to use springs just stiff enough to support the turntable. |